Type: Article
Publication Date: 2002-06-12
Citations: 45
DOI: https://doi.org/10.1090/s0002-9939-02-06653-4
A Borel (or even analytic) subring of $\mathbb R$ either has Hausdorff dimension $0$ or is all of $\mathbb R$. Extensions of the method of proof yield (among other things) that any analytic subring of $\mathbb C$ having positive Hausdorff dimension is equal to either $\mathbb R$ or $\mathbb C$.